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JPS55138889

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DESCRIPTION JPS55138889
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
coaxial speaker, and FIG. 2 is a cross-sectional view showing a coaxial speaker according to an
embodiment of the present invention. In the drawing, 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· outer frame, 11 · · · · · · inner frame, 15... Tweeter frame, 12... Pole piece, 13... Magnet. In the
drawings, the same reference numerals indicate the same or corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a
speaker incorporating a tweeter at the center of the woofer. Conventionally, as this type of
speaker, as shown in FIG. 1, there is known a coaxial speaker in which a cone-shaped tweeter is
incorporated in the center of a flat woofer having a ring flat diaphragm. In Fig. 1 (1) / ・ · '', (1) is
a yoke, (2) is a maggi), f3 + is a plate to form a magnetic circuit of a part of the woofer, and an
outer frame (4) It is fixed by (5). And a diaphragm (6), a spider (7), and a voice coil (8) are
adhered to this by adhesion, and a woofer is completed. (9) is an outer edge for supporting the
diaphragm, and 顛 is also an inner edge. αB is an inner frame which doubles as a run for fixing
the inner edge a and a mount for fixing a part of the tweeter to a part of the woofer, and is fixed
on the play +31 by a mounting screw ■. On the other hand, a part of the tweeter is a pole piece
of lI, (+3 magnet, a magnetic plate is composed of a plate, to which a tweeter frame α9 is fixed
by a mounting screw aS, diaphragm surface, voice coil Q · · , The spider aIB, the vibration system
of the dust cap (2) is fixed by the adhesive, and the tweeter is completed. A part of the tweeter is
screwed to the inner frame a by a mounting screw (good) and fixed to a part of the woofer. As
described above, the conventional coaxial speaker has a large number of parts (2) and the
structure is complicated, and the assembly operation of the speaker is very complicated. Since
the contact area between the yoke f11 and the outer frame (4) can not be taken wide due to the
structure and structure, there are many problems in the reliability of the bonding strength. The
size of the outer diameter of the magnetic circuit of the tweeter portion can not be made larger
than the inner diameter of the inner frame 0 ° C. in relation to fixing the tweeter portion to the
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inner frame o11. On the other hand, although the inner diameter dimension of the inner frame IIl
is restricted to a fixed dimension which is more fixed than the design of the woofer part, this
dimension is a considerably smaller dimension. Accordingly, the outer diameter of the magnetic
circuit of a part of the tweeter has to be made quite small due to its structure. However, because
the design of the magnetic circuit is greatly restricted in order to make the tweeter part highperformance, it has been extremely technically difficult. The present invention has been made to
solve the above-mentioned conventional drawbacks, namely, the outer frame (4), the inner frame
111), and the tweeter frame 11 'are manufactured by integral molding, one at the time of
molding. Woofer 'Some magnetic circuit and tweeter some magnet]' Fixing 11μ to the frame
from (3) to K than K, the number of parts of the speaker will be smaller, the structure will be
simpler, and the speaker assembly work Efficiency is greatly improved.
In addition, the yoke (11 and the joint strength between the frame, which has conventionally
been a problem, also becomes sufficiently strong. Further, according to the present invention,
since the inner frame frame and the tweeter frame i + 9 are shared, the outer diameter of the
magnetic circuit of the tweeter can be enlarged by the space in which the conventional tweeter
frame 09 was stored, Since the design constraints are relaxed, some tweeters have the advantage
that they can be more sophisticated than conventional ones. FIG. 2 is a cross-sectional view
showing an embodiment of the present invention, but in the figure (c) is an integral frame, an
outer frame (4+, inner frame αl) in a conventional speaker, a tweeter frame 1! A portion
corresponding to 1 is integrally formed, and a woofer partial magnetic circuit and pole piece 12
comprising a yoke (11), a magnet (2) and a plate (3) are integrally formed in the integral frame
(3). A tweeter (4) part magnetic circuit composed of a magnet value 3 and a plate I is molded.
Therefore, there is no need for assembling work such as the conventional bonding of the outer
frame and the woofer-magnetic circuit, the bonding of the tweeter frame and the tweetermagnetic circuit, and the mounting of the inner frame. In this case, the yoke (1), the magnet (2),
and the plate (3) may be molded as a magnetic circuit in advance by bonding or the like, but may
be molded, but the yoke (1), magnet) + 21, the plate (3) The moldability is improved by molding
and molding the magnetic circuit by molding up to 1 of the part state. As a material of the
integral frame G of the present invention, a plastic material is suitable. In the above embodiment,
both the woofer partial magnetic circuit and the tweeter partial magnetic circuit are molded, but
in some cases, either one of them may be molded and the other may be attached later. It is. In the
embodiment, the case where the tweeter is a cone-shaped tweeter has been described, but the
present invention can be similarly applied to a flat plate (5) shape, a dome shape or a horn shape,
and the same effect can be obtained. As described in Jit, according to the present invention, the
assembling operation of the speaker is largely altered, and an inexpensive one can be provided,
which has the effect of obtaining a high performance and highly reliable turtle.
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